JP3401832B2 - Contour compensator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contour compensating device for extracting and emphasizing contours of a video signal in a digital video signal processing device for arithmetically processing a digital video signal.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing a general structure of a conventional contour compensator. In the figure, 1 is an input terminal for inputting a digital video signal, 2 is a line memory for delaying the digital video signal input from the input terminal 1 by one vertical block, and 3 is a signal output from the line memory 2.
A line memory for delaying in units of vertical blocks, 4 is a digital video signal input from an input terminal 1 and a line memory 3
Adder circuit 5 for adding the output signals from the adder circuit 4
A 1/2 coefficient circuit that halves the output signal, 6 is a horizontal block unit delay circuit that delays the signal output from the 1/2 coefficient circuit 5 by 1 horizontal block, and 7 is a signal output from the line memory 2. Is a horizontal block unit delay circuit for delaying by 1 horizontal block unit, and 8 is a horizontal block unit delay circuit 6 from the signal output from the horizontal block unit delay circuit 7.
A subtraction circuit for subtracting the output signal, a horizontal block unit delay circuit 9 for delaying the signal output from the horizontal block unit delay circuit 7 by one horizontal block, and a reference numeral 10 for the signal output from the line memory 2 and the horizontal block unit delay circuit. 9
An adder circuit for adding the signals output from the adder circuit; 11 is a 1/2 coefficient circuit for multiplying the signal output from the adder circuit by 1/2;
Reference numeral 12 is a subtraction circuit for subtracting the signal output from the 1/2 coefficient circuit 11 from the signal output from the horizontal block unit delay circuit 7, and 13 is the signal output from the subtraction circuit 8 and the subtraction circuit 1.
An adder circuit for adding the signals output from 2 and 14 is a signal output from the horizontal block unit delay circuit 7 and the adder circuit 13
An adder circuit for adding the signals output from the adder circuit 15 and an output terminal 15 for outputting the signal output from the adder circuit 14 to the next stage signal processing circuit.

Next, the operation will be described. A digital video signal input from the input terminal 1 is input to the line memory 2 and delayed by one vertical block unit. Further, the line memory 3 delays the output signal of the line memory 2 by one vertical block.

The adder circuit 4 adds a digital video signal input from the input terminal 1 and a signal delayed by two vertical blocks to the input digital video signal output from the line memory 3. The 1/2 coefficient circuit 5 multiplies the signal level of the output signal of the adding circuit 4 by 1/2. The horizontal block unit delay circuit 6 delays the output signal of the 1/2 coefficient circuit 5 by one horizontal block unit and adjusts the delay time in the horizontal direction.

FIG. 8 is an explanatory diagram of the conventional vertical contour compensation signal calculation. The horizontal block unit delay circuit 7 delays the output signal of the line memory 2 by one horizontal block. Then, the subtraction circuit 8 subtracts the output signal of the horizontal block unit delay circuit 6 from the output signal of the horizontal block unit delay circuit 7 to calculate a vertical contour compensation signal.

FIG. 9 is an explanatory view of the conventional calculation of a horizontal contour compensation signal. The horizontal block unit delay circuit 9 delays the output signal of the horizontal block unit delay circuit 7 by one horizontal block. The adder circuit 10 adds the signal delayed by two horizontal block units to the output signal of the line memory 2 and the second output signal output from the horizontal block unit delay circuit 9. The 1/2 coefficient circuit 11 multiplies the signal level of the output signal of the adding circuit 10 by 1/2. Then, the subtraction circuit 12 subtracts the output signal of the 1/2 coefficient circuit 11 from the output signal of the horizontal block unit delay circuit 7 to calculate a horizontal edge compensation signal.

Next, the adder circuit 13 adds the vertical contour compensation signal calculated by the subtraction circuit 8 and the horizontal contour compensation signal calculated by the subtraction circuit 12. And adder circuit 1
Reference numeral 4 adds the contour compensation signal calculated and output by the adder circuit 13 to the output signal of the horizontal block unit delay circuit 7. Then, the contour-compensated video signal is output from the output terminal 15.

[0008]

Since the conventional contour compensating apparatus is configured as described above, a vertical striped signal in which a high level signal and a low level signal are alternately arranged for each horizontal block unit, Or a thin vertical streak signal,
A horizontal striped signal in which a high level signal and a low level signal are alternately arranged for each vertical block unit, or a thin horizontal streak signal, or a thin vertical line or a horizontal line with an end, a fine dot-shaped signal. When a signal is present on the screen, contour compensation is excessively applied, resulting in an unnatural image.

The present invention has been made in order to solve the above-mentioned problems, and vertical stripes in which a signal having a higher level and a signal having a lower level are alternately arranged for a fixed period every horizontal block unit from a digital video signal. Of a horizontal stripe signal in which a high-level signal and a low-level signal alternate alternately for a certain period in each vertical block unit is detected, and the contour compensation signal gain in this area is detected. It is an object of the present invention to provide a contour compensating apparatus which can obtain a good image signal with a proper amount of contour compensation by lowering the contour and performing contour compensation with the contour compensation signal in either the horizontal direction or the vertical direction.

[0010]

According to a first aspect of the present invention, there is provided a contour compensating apparatus which delays an input video signal in at least one direction from a horizontal direction to a vertical direction by a unit time and performs a calculation.
A high pass filter, a contour compensation signal generating means for generating a contour compensation signal based on a high frequency component output from the high pass filter, and a contour generated by the contour compensation signal generating means. Based on the compensation signal,
Detection means the sign of the value of the contour compensation signal to detect the vertically striped and / or horizontal stripe signal area varies alternately positive and negative for each of the unit time, based on the signal detected by the detection means, the contour compensating And a gain reducing means for reducing the gain of the signal.

The contour compensating apparatus according to a second aspect of the present invention includes a delay means and a computing means for delaying an input video signal in any one of the horizontal direction and the vertical direction by a unit time.
A first high pass filter configured, the first high-frequency
Based on the high frequency component output from the pass filter, contour correction is performed.
First contour compensation signal generating means for generating a compensation signal ;
Contour compensation signal generated from first contour compensation signal generating means
The sign of the value of the contour compensation signal is based on
Vertical striped or horizontal striped signal area that alternates between positive and negative for each interval
Detection means for detecting the frequency was detected by the detection means
Based on the signal, interest <br/> resulting reduction means and the input video signal to the unit time delay of the other direction for reducing the gain of the contour compensation signal
A second high-pass filter composed of delaying means and computing means, and output from the second high-pass filter
Second for generating a contour compensation signal based on the high frequency component to be reproduced
The contour compensation signal generating means outputs the gain reduction contour compensation signal output from said gain reducing means, among the contour compensation signal generated from the upper Symbol second contour compensation signal generating means, the larger the absolute value it is obtained by an absolute value output means.

Further, the contour compensating apparatus according to the invention of claim 3, the delay for delaying the input video signal in the horizontal direction per unit time
A first high-pass filter composed of means and computing means, and a high-pass filter output from the first high-pass filter.
A first contour compensation signal generating means for generating a contour compensation signal based on a range component; and the first contour compensation signal generating means.
Based on the contour compensation signal generated from
The sign of the value of
First detection means for detecting a striped signal area, and the above detection
The contour compensation signal based on the signal detected by the means
The first gain reducing means for reducing the gain of the
A delay means for delaying the input video signal by a unit time and a computing means
A second high-pass filter composed of:
Based on the high-frequency components output from the high-pass filter of
Second contour compensation signal generating means for generating a contour compensation signal
And a contour generated from the second contour compensation signal generating means
The sign of the value of the contour compensation signal is
Horizontal striped signal area that alternates between positive and negative for each unit time
By the second detecting means for detecting
Gain of the contour compensation signal based on the detected signal
A second gain reducing means for reducing, and the first gain reduction contour compensation signal that will be output from the gain reducing means, the second
The gain reduction contour compensation signal output from the gain reduction means is provided with an absolute value output means for outputting the one having a larger absolute value.

Further, in the contour compensating apparatus according to the invention of claim 4, the contour compensating signal outputted from the absolute value output means is further provided.
And an input means for adding the input video signal
It

[0014]

In the contour compensating apparatus constructed as described above, there is a vertical striped signal in which a signal having a higher level and a signal having a lower level are alternately arranged for each horizontal block unit for a certain period of time in a digital video signal, or Detecting a region where horizontal stripe-shaped signals in which high-level signals and low-level signals are alternately arranged for a certain period every vertical block unit time are present, and lowers the gain of the contour compensation signal in this region, and also in the horizontal direction. Alternatively, contour compensation is performed with one of the contour compensation signals in the vertical direction, so that a proper amount of contour-compensated video signal is obtained.

[0015]

EXAMPLES Example 1. FIG. 1 is a diagram showing a configuration of a contour compensating apparatus according to an embodiment. In the figure, 1 to 12 and 15 are the same as those of the conventional contour compensating apparatus. 14 is a horizontal block unit delay circuit 7
An adder circuit for adding the signal output from the subtraction circuit 8 and the signal output from the subtraction circuit 12 as input,
This is a maximum value circuit that outputs the signal with the larger absolute value.

Next, the operation will be described. 1 to 12 operate similarly to the conventional contour compensation device. Maximum value circuit 16
Calculates a signal having a larger absolute value between the vertical contour compensation signal output from the subtraction circuit 8 and the horizontal contour compensation signal output from the subtraction circuit 12.

The adder circuit 14 adds the contour compensation signal output from the maximum value circuit 16 to a signal obtained by time-delaying the input digital video signal which is the output signal of the horizontal block unit delay circuit 7. Then, the contour-compensated video signal is output from the output terminal 15.

By the above operation, both the horizontal contour compensation signal and the vertical contour compensation signal are calculated, and the double contour compensated area is the contour compensation signal having the larger absolute value. The contour compensation is performed by.

Embodiment 2 FIG. 2 is a diagram showing the structure of a contour compensating apparatus according to an embodiment. In the figure, 1 to 12 and 15 are the same as those of the conventional contour compensation device. 14 is a horizontal block unit delay circuit 9
An adder circuit for adding a signal output from a maximum value circuit 16 described later, and 16 an input of a signal output from a horizontal block unit delay circuit 20 described later and a signal output from a gain reduction circuit 19 described later, A maximum value circuit that outputs a signal having a larger absolute value of both, 17 is a horizontal detection circuit that receives the signal output from the subtraction circuit 12 as input, and detects a horizontal contour reduction region, and 18 is output from the subtraction circuit 12. A horizontal block unit delay circuit for delaying the signal by one horizontal block unit, 19 is a horizontal block unit delay circuit 1
The signal output from 8 and the signal output from the horizontal detection circuit 17 are used as inputs, and a gain reduction circuit that reduces the gain of the horizontal contour compensation signal by the control signal is denoted by 20. The signal output from the subtraction circuit 8 is delayed by one horizontal block. This is a horizontal block unit delay circuit.

Next, the operation will be described. 1 to 12 operate similarly to the conventional contour compensation device. Horizontal detection circuit 1
Reference numeral 7 detects areas in which the signal value signs of the central sampling point and both points deviated from the central sampling point by one horizontal block unit time before and after as shown in FIG. Output a control signal.

The horizontal block unit delay circuit 18 delays the horizontal contour compensation signal output from the subtraction circuit 12 by one horizontal block and adjusts the horizontal delay time. And
The gain reduction circuit 19 reduces the level of the horizontal contour compensation signal output from the horizontal block unit delay circuit 18 by the control signal output from the horizontal detection circuit 17.

The horizontal block unit delay circuit 20 delays the vertical direction contour compensation signal output from the subtraction circuit 8 by one horizontal block unit and adjusts the delay time in the horizontal direction. And
The maximum value circuit 16 calculates the signal having the larger absolute value from the vertical contour compensation signal output from the horizontal block unit delay circuit 20 and the horizontal contour compensation signal output from the gain reduction circuit 19.

The adder circuit 14 adds the contour compensation signal output from the maximum value circuit 16 to the signal obtained by time-delaying the input digital video signal which is the output signal of the horizontal block unit delay circuit 9. Then, the contour-compensated video signal is output from the output terminal 15.

With the above operation, the over-compensation area of the horizontal contour compensation signal is detected, the horizontal contour compensation signal in the area is reduced, and the horizontal contour compensation signal and the vertical contour compensation signal are detected. Both are calculated,
In the area where the contour is double compensated, contour compensation is performed by the contour compensation signal having the larger absolute value.

Example 3. FIG. 3 is a diagram showing the configuration of the contour compensating apparatus according to one embodiment. In the figure, 1 to 5, 9, 11 to 12 and 15 are the same as those of the conventional contour compensation device. 7 is the line memory 3
A horizontal block unit delay circuit for delaying the output signal by one horizontal block unit, 8 is a subtraction circuit for subtracting the signal output from the 1/2 coefficient circuit 5 from the signal output from the line memory 2, and 10 is an output from the line memory 3. Is added to the signal output from the horizontal block unit delay circuit 9, 14 is an adder circuit that adds the signal output from the horizontal block unit delay circuit 7 to the signal output from a maximum value circuit 16 described later, and 16 is A maximum value circuit that receives the output signal of the horizontal block unit delay circuit 20 and the output signal of the subtraction circuit 12 to be described later and calculates the signal whose absolute value is larger, 20 is a signal output from the gain reduction circuit 23 to be described later. Is a horizontal block unit delay circuit for delaying by 1 horizontal block unit, and 21 receives the signal output from the subtraction circuit 8 as an input,
A vertical detection circuit for detecting a vertical contour reduction region, 22
Is a line memory that delays the signal output from the subtraction circuit 8 by one vertical block unit, and 23 is a control signal that controls the gain of the vertical direction contour compensation signal using the signal output from the line memory 22 and the signal output from the vertical detection circuit 21 as inputs. Is a gain reduction circuit that reduces

Next, the operation will be described. 1 to 5 and 9 operate similarly to the conventional contour compensation device. The horizontal block unit delay circuit 7 delays the output signal of the line memory 3 by one horizontal block. Then, the adder circuit 10 adds the output signal of the line memory 3 and the output signal of the horizontal block unit delay circuit 9. 11 to 12 operate in the same manner as the conventional contour compensating device, and calculate the contour compensation signal in the horizontal direction.

The subtraction circuit 8 subtracts the output signal of the 1/2 coefficient circuit 5 from the output signal of the line memory 2 to calculate a vertical contour compensation signal.

In the vertical detection circuit 21, the sign of the signal value at the center sampling point as shown in FIG. It detects different areas and outputs a control signal.

The line memory 22 delays the vertical contour compensation signal output from the subtraction circuit 8 by one vertical block unit and adjusts the delay time in the vertical direction. Then, the gain reduction circuit 2
Reference numeral 3 reduces the level of the vertical contour compensation signal output from the line memory 22 by the control signal output from the vertical detection circuit 21.

The horizontal block unit delay circuit 20 delays the output signal of the gain reducing circuit 23 by one horizontal block unit and adjusts the delay time in the horizontal direction. Then, the maximum value circuit 16
Calculates the signal having the larger absolute value of the vertical contour compensation signal output from the horizontal block unit delay circuit 20 and the horizontal contour compensation signal output from the subtraction circuit 12.

The adder circuit 14 adds the contour compensation signal output from the maximum value circuit 16 to the signal obtained by time-delaying the input digital video signal which is the output signal of the horizontal block unit delay circuit 7. Then, the contour-compensated video signal is output from the output terminal 15.

With the above operation, the over-compensation area of the vertical contour compensation signal is detected, the vertical contour compensation signal in the area is reduced, and the horizontal contour compensation signal and the vertical contour compensation signal are detected. Both are calculated,
In the area where the contour is double compensated, contour compensation is performed by the contour compensation signal having the larger absolute value.

Example 4. FIG. 4 is a diagram showing the configuration of the contour compensating apparatus according to one embodiment. In the figure, 1 to 5, 9, 11 to 12 and 15 are the same as those of the conventional contour compensation device. 7 is the line memory 3
A horizontal block unit delay circuit for delaying the output signal by one horizontal block unit, 8 is a subtraction circuit for subtracting the signal output from the 1/2 coefficient circuit 5 from the signal output from the line memory 2, and 10 is an output from the line memory 3. An adder circuit for adding the signal output from the horizontal block unit delay circuit 9 and an adder circuit 14 for adding the signal output from the horizontal block unit delay circuit 9 and the signal output from a maximum value circuit 16 to be described later. A maximum value circuit for inputting an output signal of a gain control circuit 19 described later and an output signal of a horizontal block unit delay circuit 24 described later to calculate a signal having a larger absolute value, and 17 is a signal output from the subtraction circuit 12. Is a horizontal detection circuit for detecting a horizontal contour reduction area, and 18 is a horizontal block unit delay of the signal output from the subtraction circuit 12. Horizontal block unit delay circuit that, 19
Is a gain reduction circuit that receives the signal output from the horizontal block unit delay circuit 18 and the signal output from the horizontal detection circuit 17, and reduces the gain of the horizontal contour compensation signal by the control signal. Reference numeral 20 indicates a gain reduction circuit 23 described later. A horizontal block unit delay circuit for delaying the output signal by one horizontal block unit, 21 receives the signal output from the subtraction circuit 8, and
A vertical detection circuit for detecting a vertical contour reduction region, 22
Is a line memory that delays the signal output from the subtraction circuit 8 by one vertical block unit, and 23 is a control signal that controls the gain of the vertical direction contour compensation signal using the signal output from the line memory 22 and the signal output from the vertical detection circuit 21 as inputs. A gain reduction circuit, and 24 is a horizontal block unit delay circuit 2.
A horizontal block unit delay circuit for delaying a signal output from 0 by one horizontal block unit.

Next, the operation will be described. 1 to 5 and 9 operate similarly to the conventional contour compensation device. The horizontal block unit delay circuit 7 delays the output signal of the line memory 3 by one horizontal block. Then, the adder circuit 10 adds the output signal of the line memory 3 and the output signal of the horizontal block unit delay circuit 9. 11 to 12 operate in the same manner as the conventional contour compensating device, and calculate the contour compensation signal in the horizontal direction.

The subtraction circuit 8 subtracts the output signal of the 1/2 coefficient circuit 5 from the output signal of the line memory 2 to calculate a contour compensation signal in the vertical direction.

The horizontal detection circuit 17 detects areas in which the signal values of the central sample point and the points shifted by one horizontal block unit time before and after the horizontal contour compensation signal are different from each other, and outputs a control signal.

The horizontal block unit delay circuit 18 delays the horizontal contour compensation signal output from the subtraction circuit 12 by one horizontal block and adjusts the horizontal delay time. And
The gain reduction circuit 19 reduces the level of the horizontal contour compensation signal output from the horizontal block unit delay circuit 18 by the control signal output from the horizontal detection circuit 17.

The vertical detection circuit 21 detects areas in which the sign of the signal value is different between the central sampling point and the points deviated by about one vertical block unit time from the vertical contour compensation signal, and outputs a control signal.

The line memory 22 delays the vertical contour compensation signal output from the subtraction circuit 8 in units of one vertical block to adjust the delay time in the vertical direction. Then, the gain reduction circuit 2
Reference numeral 3 reduces the level of the vertical contour compensation signal output from the line memory 22 by the control signal output from the vertical detection circuit 21.

The horizontal block unit delay circuit 20 delays the output signal of the gain reduction circuit 23 by one horizontal block unit to adjust the delay time in the horizontal direction. The horizontal block unit delay circuit 24 delays the output signal of the horizontal block unit delay circuit 20 by one horizontal block. And the maximum value circuit 1
Reference numeral 6 calculates the signal having the larger absolute value of the vertical contour compensation signal output from the horizontal block unit delay circuit 24 and the horizontal contour compensation signal output from the gain reduction circuit 19.

The adder circuit 14 adds the contour compensation signal output from the maximum value circuit 16 to the signal obtained by time-delaying the input digital video signal which is the output signal of the horizontal block unit delay circuit 9. Then, the contour-compensated video signal is output from the output terminal 15.

With the above operation, the over-compensation area of the horizontal contour compensation signal is detected, the horizontal contour compensation signal in the area is reduced, and the over-compensation area of the vertical contour compensation signal is detected. so as to reduce the vertical contour compensation signal in that region, and is calculated both horizontal edge compensation signal and vertical contour compensation signal, the region has been contour compensation doubly, absolute among them
The contour compensation is performed by the contour compensation signal having the larger logarithmic value.

[0043]

As described above, according to the present invention, the horizontal direction
Input video signal in at least one direction from vertical to vertical
The detection means for detecting the over-compensation region and the detection means
The detected signal is used to reduce the gain of the contour compensation signal.
And gain reducing means for reducing the
A signal that has a higher level for each horizontal block than the video signal.
No. and low-level signals alternate vertically for a fixed period
Area where the signal exists, or in units of 1 vertical block
And a high level signal and a low level signal alternate
For each area where horizontal stripes exist for a fixed period,
A good video signal with proper contour compensation in the direction can be obtained.
effective.

Any one of the horizontal direction and the vertical direction
Direction input video signal only
If contour compensation is performed using steps and,
Gain reduction contour output from the above-mentioned gain reduction means
Compensation signal and from the contour compensation signal generation means in the other direction
Output the contour compensation signal that has the largest absolute value
Since the absolute value output means for
A video signal that has been properly compensated without being compensated
There is an effect to be obtained.

On the other hand, input in both horizontal and vertical directions
Using the detection means and the gain reduction means for the force video signal
When performing contour compensation, gain reduction procedures in both directions are required.
Each of the gain-reducing contour compensation signals output from the stage
The absolute value output means that outputs the one with the larger absolute value
Since it is equipped, it is moderate without being over-compensated for contours.
The effect is that a contour-compensated video signal can be obtained.

The absolute value output means outputs the data.
The addition means for adding the contour compensation signal and the input video signal
Furthermore, since it is equipped with a video signal that has been appropriately contour-compensated
There is an effect to be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a contour compensating apparatus according to a first embodiment .

FIG. 2 is a diagram showing a configuration of a contour compensating apparatus according to a second embodiment .

FIG. 3 is a diagram showing a configuration of a contour compensating apparatus according to a third embodiment .

FIG. 4 is a diagram showing a configuration of a contour compensating apparatus according to a fourth embodiment .

FIG. 5 is an explanatory diagram of horizontal control signal calculation according to the present invention.

FIG. 6 is an explanatory diagram of vertical control signal calculation according to the present invention.

FIG. 7 is a diagram showing a general configuration of a conventional contour compensation device.

FIG. 8 is an explanatory diagram of conventional vertical contour compensation signal calculation.

FIG. 9 is an explanatory diagram of conventional horizontal contour compensation signal calculation.

[Explanation of symbols]

1 input terminal 2,3,22 line memory 4,10,14 adder circuit 5,11 1/2 coefficient circuit 6,7,9,18,20,24 horizontal block unit delay circuit 8,12 subtractor circuit 15 output terminal 16 Maximum value circuit 17 Horizontal detection circuits 19 and 23 Gain reduction circuit 21 Vertical detection circuit

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5/14-5/217 G06T 5/00

Claims (4)

(57) [Claims] 1. A delay unit for delaying a unit time of an input video signal in at least one direction from the horizontal direction to the vertical direction, and calculation.
Means, a contour compensation signal generating means for generating a contour compensation signal based on the high frequency component output from the high pass filter, and a contour generated by the contour compensation signal generating means. based on the compensation signal, vertical stripes and / or horizontal stripe signal the sign of the value of the contour compensation signal is changed alternately positive and negative for each of the unit time
Detecting means for detecting a No. region, based on the signal detected by the detection means, the contour compensating apparatus characterized by comprising a gain reducing means for reducing the gain of the contour compensation signal. 2. A delay means and a calculator for delaying an input video signal in any one of a horizontal direction and a vertical direction by a unit time.
A first high pass filter composed of a stage, the high-frequency component output from said first high pass filter
A first contour compensation signal generating means for generating a contour compensation signal based, contour compensation generated from the first contour compensation signal generating means
Based on the signal, the sign of the value of the contour compensation signal is
Vertical striped or horizontal striped signals that alternate between positive and negative for each unit time.
Detecting means for detecting a No. region, based on the detected signals by the detection means, the outline
Gain reducing means for reducing the gain of the compensation signal, delay means for delaying the input video signal in the other direction unit time
A second high pass filter constituted by an arithmetic unit, the high-frequency component output from the second high-pass filter
A second contour compensation signal generating means for generating a contour compensation signal based, the gain reduction contour compensation signal output from said gain reducing means, the contour compensation signal generated from the upper Symbol second contour compensation signal generating means of, contour compensator you characterized in that an absolute value output means for outputting the larger absolute value. 3. A unit horizontal input video signal time delay
A first high pass filter constituted by the delay means and computing means for, on the high-frequency component output from said first high pass filter
A first contour compensation signal generating means for generating a contour compensation signal based, contour compensation generated from the first contour compensation signal generating means
Based on the signal, the sign of the value of the contour compensation signal is
The vertical striped signal area that alternates between positive and negative for each unit time is detected.
First detecting means for output, based on a signal detected by the detection means, the outline
First gain reducing means, delay means for delaying the vertical unit an input video signal of time to reduce the gain of the compensation signal
Second high-pass filter configured by
And the high frequency component output from the second high pass filter
Generating a second contour compensation signal based on the
Live means and contour compensation generated from the second contour compensation signal generating means
Based on the signal, the sign of the value of the contour compensation signal is
The horizontal striped signal area, which alternates between positive and negative for each unit time, is detected.
Based on the output second detecting means and the signal detected by the second detecting means,
Second gain reducing means for reducing the gain of the contour compensation signal
When, the the gain reduction contour compensation signal that will be output from the first gain reducing means, the gain output from said second gain reducing means
Of reduced contour compensation signal, contour compensator characterized in that an absolute value output means for outputting the larger absolute value. 4. The contour compensating apparatus according to claim 2, further comprising an adding means for adding the contour compensating signal output from the absolute value output means and the input video signal.